Linux Kernel up to 6.18.32/7.0.9 net psp_assoc_device_get_locked lock locking

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.32/7.0.9. It has been rated as critical. The affected element is the function psp_assoc_device_get_locked of the component net. Performing a manipulation of the argument lock results in locking. This vulnerability is identified as CVE-2026-52979. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.18.32/7.0.9. This affects the function psp_assoc_device_get_locked of the component net. The manipulation of the argument lock with an unknown input leads to a locking vulnerability. CWE is classifying the issue as CWE-667. The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: net: psp: check for device unregister when creating assoc psp_assoc_device_get_locked() obtains a psp_dev reference via psp_dev_get_for_sock() (which uses psp_dev_tryget() under RCU); it then acquires psd->lock and drops the reference. Before the lock is taken, psp_dev_unregister() can run to completion: take psd->lock, clear out state, unlock, drop the registration reference. The expectation is that the lock prevents device unregistration, but much like with netdevs special care has to be taken when "upgrading" a reference to a locked device. Add the missing check if device is still alive. psp_dev_is_registered() exists already but had no callers, which makes me wonder if I either forgot to add this or lost the check during refactoring...

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-52979 since 06/09/2026. Technical details are known, but no exploit is available.

Upgrading to version 6.18.33 or 7.0.10 eliminates this vulnerability. Applying the patch d90df5ce6deb2424de3ad89bcc693ac1b67accc9/e201c57073e624dd2ba5beaf9eda31e19b77b332/b89769f936a8fa9e66de72ddc1b71a9745a488e6 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.18.16
• 6.18.17
• 6.18.18
• 6.18.19
• 6.18.20
• 6.18.21
• 6.18.22
• 6.18.23
• 6.18.24
• 6.18.25
• 6.18.26
• 6.18.27
• 6.18.28
• 6.18.29
• 6.18.30
• 6.18.31
• 6.18.32
• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9

License

• open-source

Website

• Vendor: https://www.kernel.org/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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